Compact high-resolution soft-x-ray spectrograph design using two matched grazing-incidence gratings

Area of Science:

• Plasma Physics
• Spectroscopy
• Optics

Background:

• High-resolution spectroscopy is crucial for analyzing plasma characteristics.
• Existing soft-x-ray spectrographs often face limitations in resolution, size, or complexity.

Purpose of the Study:

• To present and analyze a novel, simple soft-x-ray grating spectrograph design.
• To achieve high spectral resolution (λ/Δλ > 25,000) in a compact instrument.

Main Methods:

• The design employs dual, matched, concave varied-groove-density gratings.
• Analysis focuses on dispersion, slit magnification, and achievable spectral resolution.

Main Results:

• The spectrograph achieves a spectral resolution exceeding 25,000.
• The instrument is less than 1 meter in length, suitable for detectors with coarse spatial resolution.
• Key advantages include simplicity and small size.

Conclusions:

• The novel design offers a simple and compact solution for high-resolution soft-x-ray spectroscopy.
• Potential applications include precise measurements of x-ray laser linewidths.
• A trade-off exists between spectral resolution and the useful spectral range.